Pinpoint Test A: No Communication With The Audio Control Module: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK CIRCUIT 1111 (VT) FOR VOLTAGE
- Disconnect: Audio Control Module C240a.
- Key in ON position.
- Measure the voltage between the audio control module C240a-1, circuit 1111 (VT), harness side and ground.
  
  Fig 1: Measuring Voltage Between Audio Control Module C240A-1 Circuit 1111 (VT)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A2.
- No : REPAIR the circuit. TEST the system for normal operation.
A2 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the audio control module C240a-13, circuit 1204 (BK/OG), harness side and ground.
  
  Fig 2: Measuring Resistance Between Connector And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue network communication diagnosis.
- No : REPAIR the circuit. TEST the system for normal operation.